Drop spammy "Unable to use runtime singleton" logs (#15366)
Drop spammy "Unable to use runtime singleton" logs (#15366)

For https://github.com/envoyproxy/envoy/issues/13504

These logs have been spamming all(?) envoy deployments for a long time,
confusing users. I don't know how to "fix" them, so instead dropping the
level so it doesn't bother everyone until they are fixed properly.

Signed-off-by: John Howard <d864760d805af0f2f245f85d18382dd184bb0c60@google.com>
lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy